Visualroute is a bit browser-heavy for me but still good.

Here is a list of some Internet Exchange points , most if not all operate a looking glass section.

http://www.bgp4.as/internet-exchanges

You can also run BGP route lookups etc

I still love

http://visualroute.visualware.com/ and it's got more features recently.

From your command line though try MTR: http://en.wikipedia.org/wiki/MTR_(software)